ML19253C151
| ML19253C151 | |
| Person / Time | |
|---|---|
| Site: | Yankee Rowe |
| Issue date: | 11/15/1979 |
| From: | Ziemann D Office of Nuclear Reactor Regulation |
| To: | Groce R YANKEE ATOMIC ELECTRIC CO. |
| References | |
| NUDOCS 7911300051 | |
| Download: ML19253C151 (3) | |
Text
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NUCLEAR REGULATORY COMMISSION 7,
E WASHmCTON, D. C. 20555 g
November 15, 1979
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Docket No. 50-29 Mr. Robert H. Groce Licensing Engineer Yankee Atomic Electric Company 20 Turnpike Road Westboro, Massachusetts 01.581
Dear Mr. Groce:
We have reviewed your proposed Appendix I Radiological Technical Specifications for Yankee-Rowe (Proposed Change No.166, dated January 16,1979) based on your rtatement that the three gas decay drums in the existing waste gas system are unused and not serviceable. Specifically, our preliminary analysis shows that doses due to noble gas releases will exceed the design objectives of 10 CFR Part 50, Appendix I, Section B.1 and are therefore unacceptable. Lacking certain additional infonnation, indicated later in this letter, our analysis is based on the following assumptions:
1.
No holdup time being credited because the gas decay drums are not being used; 2.
No surge drum fill time being credited since no discrete gas volume is collected due to flow through the surge drum during colle: tion and the fact the number of discharges per year to the at"osphere is not limited by system design; 3.
The waste gas / cover gas system is assumed to be at equilibrium with respect to radioactive decay; 4.
Two primary coolant degassings per year are assumed for use in the GALE Code.
We have also evaluated the waste gas / cover gas system based on a transfer of mixed gas from the surge drum to one of the three gas decay drums (assuming that they are used) where the mixed gas is assumed to be stored for 90 days prior to release. We find that the operational method using the 3 gas decay drums would meet the requirements of 10 CFR Part 50, Appendix I.
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7911800 h6/
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Mr. Robert H. Groce November 15, 1979 Based on our foregoing preliminary findings, your acceptance of one of the following alternatives is required to continue our review:
1.
Comit to having the decay dnams operational and provide the filling frequency and holdup time; or 2.
Provide additional information on the primary coolant degassing purge frequency, the waste gas / cover gas system release history, and sufficient additional infomation such as system volumes, gaseous process variables, etc. for the system that will allow us to calculate an effective retention time for gas mixtures in the system (without the decay drums) that can be used to detemine whether or not the system is capt.ble of meeting the requirements of 10 CFR Part 50, Appendix I, 10 CFR Part 50.36a and 10 CFR Part 20.1; or 3.
Commit to and propose a Technical Specification limit on the maximum curie inventory of noble gases (considered as Xe-133) in the waste gas / cover gas system (without the decay drums) and include a surveillance requirement to show that this quantity is not exceeded.
Your response is requested within 30 days of the date of this letter.
Sincerely, t/ p mL f $das z
q Dennis L. Ziemann, Chief Operating Reactors Branch #2 Division of Operating Reactors cc: See next page 1442 257
Mr. Robert H. Groce November 15, 1979 cc Mr. Lawrence E. Minnick, President i
Yankee Atomic Electric Company 20 Turnpike Road Westboro, Massachusetts 01581 Greenfield Community College 1 College Drive Greenfield, Massachusetts 01301 1442 258